Live prices
Cheapest diesel (B7) in Carmarthen
7 stations reporting diesel (B7), ranked cheapest first.
The cheapest reported diesel (B7) in Carmarthen is £8.77 a gallon (192.9p per litre) at Murco, Tanerdy Garage, Tanerdy, Carmarthen (SA31 2EY). The average across 7 forecourts currently reporting this grade is £8.85 a gallon (194.6p per litre), so choosing the cheapest rather than an average-priced forecourt saves about £0.85 on a 50-litre fill. That local average is 1.6p per litre below the UK average of 196.2p.
The average has risen 0.1p per litre since yesterday. The average has risen 5.7p per litre since last week.
Prices last refreshed at 1:32pm on 20 September 2026, supplied through the official UK Government fuel price open data scheme and checked every 30 minutes.
| Station | Unleaded | Diesel | Premium | Super diesel | Updated |
|---|---|---|---|---|---|
 Tanerdy Garage (SA31 2EY)Tanerdy Garage, Tanerdy, Carmarthen | £7.72169.9p | £8.77192.9p | £8.11178.5p | £9.16201.5p | 46 mins ago |
| Cks Supermarket (SA31 3HL)C K's Supermarket, Old ST. Clears Road, Johnstown, Carmarthen | £7.68168.9p | £8.77192.9p | ---- | ---- | 46 mins ago |
| Gwalia Garage (SA32 7DR)Gwalia Garage, Rhydargaeau, Carmarthen | £7.72169.9p | £8.77192.9p | £8.11178.5p | £9.16201.5p | 46 mins ago |
| Derwydd Services (SA33 6TP)Derwydd Garage, Cynwyl Elfed, Carmarthen, SA33 6TP, Carmarthen | £7.59166.9p | £8.81193.9p | £8.00175.9p | ---- | 46 mins ago |
 Mfg Morrisons Carmarthen (SA31 2NF)24hParc Pensarn, Carmarthen, Carmarthenshire | £7.77170.9p | £8.86194.9p | £8.45185.9p | ---- | 46 mins ago |
 Asda White Mill Express Petrol (SA32 7EN)A40, Carmarthen, Carmarthen | £7.95174.9p | £8.86194.9p | ---- | ---- | 46 mins ago |
 Ascona Tenby Road Service Station (SA33 5DT)24hLysonnen Road, Carmarthen, Carmarthen, Carmarthenshire | £7.81171.9p | £9.09199.9p | £9.09199.9p | £10.00219.9p | 46 mins ago |
Prices are supplied through the official UK Government fuel price open data scheme (Open Government Licence v3.0) and checked every 30 minutes. Only stations reporting diesel (B7) appear here.
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Questions about diesel (B7) in Carmarthen
- Where is the cheapest diesel (B7) in Carmarthen?
- The cheapest reported diesel (B7) in Carmarthen is 192.9p per litre at Murco, Tanerdy Garage, Tanerdy, Carmarthen (SA31 2EY). The average across 7 forecourts reporting this grade is 194.6p per litre. Prices were last refreshed at 1:32pm on 20 September 2026 from official UK Government fuel price data.
- How many stations in Carmarthen sell diesel (B7)?
- 7 forecourts in Carmarthen currently report a price for diesel (B7) through the official UK fuel price open data scheme. Stations that do not sell or report this grade are not counted.